Pneumatic core



June 26, 1928. l,674,765

E. E. DEARTH PNEUMATIG CORE Filed Sept. 22, 1926 Patented June 26, 1928.

UNITED STATES SEI-MER E. DEARTH, 0F MILWAUIKEE, WISCONSIN, QASSIGN'OR TOTHE FISE RUBBER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION0F MASSACHU- SETTS.

tire shape. It is a further object to providel an air bag structurewhich will be simple in form and economical to manufacture. Other andfurther objects will be apparent from the following specification andclaims.

In the accompanying drawings Iwhich illustrate one embodiment of myinvention.

Figure 1 is a perspective view of the air bag of my invention,

Figure 2 is a cross-sectional view of the air bag in relation to thetire casing, while thev latter is in band form,'

casing and air bag after forming to tire shape, and

Figure 4 is a similar view showing one manner of securing the bead ed esof the casing and bag preparatory to in ation during vulcanizationFigure 5 is a view similar to Figure 2 but y showing a modiedform ofbag.

Figure 6 is a view 'similar to Figure .4, but

showing t e bag of Figure 5. c

Referri g to the drawings 1 designates my improved Iair bag which isin'the'form of a cylindrical band of suitable width and of a diametersubstantially equal tothe linterior diameter of? the tire casing 2 whenthe latter is in band form. The bag 1 may be formed of any suitablestock such as the bag stocks now in use. The bag 1 in the form shown inFigure 1 is positioned upon the expander, used to shape the lat casings,and the casing is then positioned over it as shown in Figure 2. `It willbe understood that any con; ventional type of expander may be used. TheHat casing with the air bag therein is Figure 3 is a similar sectionshowing the- PNEUMATIC coma Application med september 242, raza.r`serial no. 137,005.

then brought to shape, by the operatidn of the expander,'as shown inFigure 3. The

bead edges of the casing and ofthe air bag are then clamped in sealedrelation by suitable bead rings conventionally indicated at 4 and 5 witha spacer ring 6 provided with an air valve 7 sealing the edges of theair bag. This assembly is then placed in a suitable mold and cured inany conventional manner. i f

In Figures 5 and 6 I have shown a modified form of bag in which theedges are provided with thickened portions 10 and 11 which when the bagis in position as shown in Figure 6 form the clos-ure for the bag, andthe place of the separable ring 6. It will be understood that ifdesiredthe portions10 and 11 may be reinforced as by the addition offabric strips.

It will be seen thatwith vmy construction the air bag may be formeddlrectly vfrom a sheetof `ealendered stock, obviating the expensiveoperation of building the bag into tubular and annular form. Further thebag4 is inserted in the sarneoperation which expands the tire to sha e,thus doing away with the insertion ofthe ag as a separate operation.

I claim: f

1. A pneumatic core for use in the vulcanization of tire casingscomprising a substantially flat band of resilient material adapted tobe'expanded into a tire easing and means 'formed integral with the edgesof the band to constitute the so expanded band into a substantially,air-tight annular chamber.

I A pneumatic core for use in the vulcanization of tire casingscomprising a substantially flat band'of resilient material adapted to beexpanded into al tirecasing, the edges of the band being thickened to llthe space between the tire beads when the latter is'positioned in amold.

In testimony whereof I have 'signed my name to ythe above specification.

ELM-ER E. ADEARTH.

